10.49 A multiple-comparison procedure for comparing four NW treatment means produced the confidence intervals shown here. Rank the means from smallest to largest. Which means are significantly different? (12): (2,15) (μ1-μ3): (4,7) (M1 - 14): (-10, 3) - (M2 M3): (-5, 11) - (M2 M4): (-12, -6) (M3 M4): (-8,-5)
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- Newspaper headlines recently announced a decline in science scores among high school seniors. In 2015, 15,109 seniors tested by The National Assessment in Education Program (NAEP scored a mean of 147 points. In 2000, 7537 seniors had averaged 150 points. The standard error of the difference in the mean scores for the two groups was 1.22. a) State the null and alternative hypotheses in terms of the appropriate parameter. Ho: p1 - µ2 HA: H1 - µ2 b) The point estimate is c) The test statistic is ? v . (If necessary, round your answer to the nearest hundredth.) d) The p-value is e) The correct decision is to Select an answer | the null hypothesis. f) There is Select an answer evidence that scores have decreased between 2000 and 2015. g) We are 95% confident that the mean score has decreased by between and points between 2000 and 2015. (If necessary, round your answers to the nearest hundredth.)4/10Suppose IQ scores were obtained for 20 randomly selected sets of twins. The 20 pairs of measurements yield x = 100.29, y = 101.75, r = 0.830, P-value = y = 6.74 + 0.95x, where x represents the IQ score of the twin born second. Find the best predicted value of y given that the twin born second has an IQ of 103? Use a significance level of 0.05. 0.000, and Click the icon to view the critical values of the Pearson correlation coefficient r. The best predicted value of y is (Round to two decimal places as needed.)
- Only about 17% of all people can wiggle their ears. Is this percent different for millionaires? Of the 356 millionaires surveyed, 78 could wiggle their ears. What can be concluded at the αα = 0.05 level of significance? The test statistic= (please show your answer to 3 decimal places.) The p-value = (Please show your answer to 3 decimal places.)A study reported the results of a randomized trial of whole-body hypothermia (cooling) for neonatal hypoxicischemic encephalopathy (brain problems in babies due to lack of oxygen). Twenty-nine of the 99 infants randomly assigned to hypothermia died and 44 of the 97 infants in the control group died. Complete parts (a) and (b) below. 1. Find the test statistic for this test. z = ___ (Round to two decimal places as needed.) 2. Find the p-value for this test. p-value = ___ (Round to three decimal places as needed.) 3. What is the conclusion for this test? Use a significance level of 0.10.Are blonde female college students more likely to have boyfriends than brunette female college students? 405 of the 663 blondes surveyed had boyfriends and 452 of the 763 brunettes surveyed had boyfriends. What can be concluded at the αα = 0.05 level of significance? For this study, we should use Select an answer z-test for the difference between two population proportions t-test for the difference between two independent population means t-test for the difference between two dependent population means z-test for a population proportion t-test for a population mean The null and alternative hypotheses would be: H0:H0: Select an answer μ1 p1 Select an answer > ≠ < = Select an answer μ2 p2 (please enter a decimal) H1:H1: Select an answer μ1 p1 Select an answer ≠ = < > Select an answer μ2 p2 (Please enter a decimal) The test statistic ? t z = (please show your answer to 3 decimal places.) The p-value = (Please show your answer to 4 decimal places.) The…
- A survey is conducted to determine if there is a The conditions for inference are met. The chi-square difference in the proportion of students, parents, and test statistic is 0.19, df = 2, and the P-value is greater than any reasonable significance level. What teachers who volunteer at least once a month. To investigate, a random sample of 45 students, 25 parents, and 12 teachers was selected from a large high school. The data are displayed in the table. conclusion should be made? There is convincing evidence that the proportions of these students, parents, and teachers who Student Parent Teacher volunteer at least once a month differs. Yes 24 12 O There is not convincing evidence that the Volunteer? No 21 13 proportion of these students, parents, and teachers who volunteer at least once a month differs. The researcher would like to test these hypotheses: O There is convincing evidence that the distribution of Họ: There is no difference in the distribution of responses for the…The effectiveness of surgery for weight loss reported here found that "The surgery was associated with significantly greater weight loss [than the control group who dieted] through 2 years (61.3 versus 11.2 pounds, P<0.001)." What test could have been used and how would it have been computed?